Posted by **kim** on Tuesday, November 8, 2011 at 7:04pm.

A ball rolls along a desktop with an uniform velocity of 3 m/s. What is the displacement after 10 seconds have passed?

A ball is thrown upward with an initial velocity of 18 m/s? What is the maximum height the ball reaches if the ball is assumed to leave from the ground?

A ball is dropped from a 35 m tall building. The ball takes how long to impact the ground?

- physics -
**Henry**, Thursday, November 10, 2011 at 3:44pm
1. D = Vt = 3m/s + 10s = 30m.

2. h = (Vf^2 - Vo^2) / 2g,

h = (0 - (18)^2) / -19.6 = 16.53m.

3. d = Vo*t + 0.5g*t^2 = 35m.

0 + 4.9t^2 = 35,

t^2 = 7.14,

t = 2.67s.

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